Ralská pahorkatina is a mountain range in northern Bohemia with an exceptionally interesting landscape. The northern part around Stráž pod Ralskem is marked not only by the activities of soldiers in the former military area, but also by uranium mining. Above Stráží rises the former volcano and the highest peak Ralsko (698 m). Tlustec (691 m), which is marked by mining, the famous Bezděz (606 m) and many other peaks are also of volcanic origin. The central and southern part is protected by the Kokořínsko - Mácha Region Protected Landscape Area, which is decorated with Mácha Lake and a number of sandstone rock towns, with deep gorges lined with rock blocks and walls.